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參數(shù)資料
| 型號(hào)： | AK4122 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 24 BIT 96KHZ SRC WITH DIR |
| 中文描述： | 24位96kHz Src與迪爾 |
| 文件頁(yè)數(shù)： | 27/54頁(yè) |
| 文件大?。?/td> | 403K |
| 代理商： | AK4122 |
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ASAHI KASEI
[AK4122]
MS0267-E-03
2004/08
- 27 -
Sampling Frequency and Pre-emphasis Detection
The AK4122 has two methods for detecting the sampling frequency. The sampling frequency is detected by comparing
the recovered clock to the MCLK2 or OMCLK frequency, and the detected frequency is reported on FS3-0 bits. XTL1-0
bits, ICKS1-0 bits and OCKS1-0 bits can select reference MCLK2 and OMCLK (Table 16). When XTL1-0 bits = “11”,
the sampling frequency is detected by the channel status sampling frequency information. The detected frequency is
reported on FS3-0 bits. The default values of FS3-0 bits are “0001”. In case of detecting the sampling frequency by
MCLK when DIR is used, MCLK (MCLK2 or OMCLK) of selected output port (PORT2 or PORT3) should be input.
MCLK2 or OMCLK
XTL1
XTL0
ICKS1 / OCKS1
ICKS0 / OCKS0
0
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
1
1
-
-
Table 16. Reference MCLK Frequency
Except XTL1-0 bit = “11”
Register Output
fs
Clock comparison
(Note 1)
MCLK Frequency
11.2896MHz
22.5792MHz
16.9344MHz
33.8688MHz
12.288MHz
24.576MHz
18.432MHz
36.864MHz
24.576MHz
N/A
36.864MHz
N/A
Use channel status
0
0
0
1
1
0
Default
XTL1-0 bit = “11”
Consumer Mode
(Note 2)
Byte3
Bit3,2,1,0
0000
0001
0010
0011
(1000)
(1010)
Professional Mode
FS3
FS2
FS1
FS0
Byte0
Bit7,6
01
(others)
10
11
00
00
Byte4
Bit6,5,4,3
0000
0000
0000
0000
1010
0010
0
0
0
0
1
1
0
0
0
0
0
0
0
0
1
1
0
1
0
1
0
1
0
0
44.1kHz
Reserved
48kHz
32kHz
88.2kHz
96kHz
±
3%
-
±
3%
±
3%
±
3%
±
3%
Table 17. fs Information
Note 1. At least
±
3% range is identified as the value in the Table 17. In case of an intermediate frequency of these two,
FS3-0 bits indicate the nearer value. When the frequency is much larger than 96kHz or much smaller than 32kHz,
FS3-0 bits may indicate “1100”, “1110” or “0001”.
Note 2. In consumer mode, Byte3 Bit3-0 are copied to FS3-0.
The pre-emphasis information is detected and reported on the PEM bit. This information is extracted from channel 1 by
default (CS12 bit = “0”). It can be switched to channel 2 by changing the CS12 bit in the control register.
Consumer mode
PEM bit
Pre-emphasis
Bit3,4,5
0
OFF
≠
0X100
1
ON
0X100
Table 18. PEM Information
Professional mode
Byte0
Bit2,3,4
≠
100
100
Byte0
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相關(guān)代理商/技術(shù)參數(shù) |
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| AK4122_1 | 制造商:AKM 制造商全稱:AKM 功能描述:24-Bit 96kHz SRC with DIR |
| AK4122A | 制造商:AKM 制造商全稱:AKM 功能描述:24-Bit 96kHz SRC with DIR |
| AK4122AVQ | 制造商:AKM 制造商全稱:AKM 功能描述:24-Bit 96kHz SRC with DIR |
| AK4122AVQP-L | 制造商:Asahi Kasei Microsystems Co Ltd 功能描述:SRC + DIR |
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